Design a vibrant Black Friday sale poster in a 16:9 landscape format. The background should be a clean black, featuring a soft gradient that transitions from dark at the top to light towards the bottom. At the center, display the text “[BLACK FRIDAY]” in large, bold sans-serif all-caps font (e.g., Montserrat or Bebas Neue), characterized by sharp edges and enhanced with neon light accents to create a glowing effect that makes it stand out prominently. The subheading “[Big Sell]” should be rendered in a contrasting serif font (e.g., Playfair Display or Georgia), slightly smaller and in mixed case, establishing a clear hierarchy between the texts. Beneath the sale message, include a bright, rectangular Call-to-Action button with rounded edges, featuring 3D shading and a glowing outline to ensure it pops against the background. Use a bold yellow color for the button to capture attention effectively. Incorporate digital motifs, such as subtle tech-inspired patterns like circuitry or grid lines, to reinforce the modern, digital shopping experience. Surround the key text and button with radiant neon light effects, creating a vibrant atmosphere of excitement and urgency. Ensure the overall layout maintains a spacious and clean aesthetic, drawing the viewer's attention directly to the text and Call-to-Action for maximum engagement. Keywords: Black Friday poster, vibrant design, modern aesthetic, bold typography, neon accents, Call-to-Action button, digital motifs, energetic atmosphere, high-contrast lighting.